Method for the production of a hollow textile material



Fatentecl duly 3, 31%5 sires METHOD FOR THE PR'ODUCTHON OF A HOLLOWTEX'EELE MATERIAL No Drawing. Application July 8, 19M,

Serial No, 401,526 I g Claims. (@l. ltd-122) The invention relates to amethod for the production of a hollow textile material. Moreparticularly, it pertains to the preparation of a hollow filamentadapted for the manufacture of textiles, and includes correlatedimprovements and discoveries whereby the qualities ofsuch filaments areenhanced.

It is an object of the invention to provide a method for the productionof a synthetic or artificial textile material.

A further object of theinventlon is the provision of a method for theproduction of a socalled hollow filament, i. e., a filament having amultiplicity of voids or gas filled vesicles, utilization being made ofa solution of a coagulatable material. containing a compound whichreacts with another compound in a coagulating bath, with, release of agas which is retained within the body of the formed filament, impartingthereto the characteristics or a hollow filament.

An additional object of the invention is to provide a method for themanufacture of a hollow filament which may be readily, eiiectively andeconomically carried out On a commercial scale and to a desired extent.

A specific object of the invention is the pro vision of a procedurewhereby a hollow filament may be produced from. viscose.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises the several steps and the relationof one or more of such steps with respect to each of the others thereof,which will be exemplified in the process hereinafter disclosed, and thescope of the invention will be indicated in the claims.

In the practice of the invention a textile material of the hollow type,more particularly a hollow filament, may be produced from a compositioncontaining a coagulatable material, as cellulose xanthate, nitrate,acetate and the like, and a cuprammonium solution of cellulose inconjunction with a substance capable of reacting, as

with an acid, in a coagulating bath, with evolution of a gas, andfinally coagulating in a suit- I able medium or bath. More particularly,there carbonate is insoluble in water it may be employed as a suspensiontherein. Moreover, the carbonate may be in the form of a normal or of aoi-carbonate, with preference attending. the use of thenormalcarbonates, as sodium carbonate NazCOs. As above stated,coagulation of such a composition leads to the formation of a material,as a filament, having a multiplicity of voids or gas filled pocketswhich give the products. ho1-' I low appearance. If desired, adelusterer, as an oxide of titanium, and a lubricant, as a mineral oil,may be incorporated with the alkali-carbonate solution prior to admixingth coagulatable material, as the xanthate, therewith. Somewhat moreparticularly as to details the procedure entails preparing an alkalicellulose through a shredding of a cellulose and treatment with a strongalkali, e. g., sodium hydroxide, followed by ripening. The alkalicellulose may then be converted into a xanthate by treatment with carbondisulfide, and this xanthate admixed with a solution containing sodiumhydroxide and a carbonate. The admixture so produced may then be ripenedwith attending deaeration, and then coagulated, as by spinning in anacid bath.

As an illustrative embodiment of a manner in which the invention may bepracticed, the following description is presented. Cellulose, as woodpulp in the form'of sheets, is treated with. a so lution of sodiumhydroxide having a concentration of about 17.6%, at a temperature offrom about 16.5 to 17.5 C. This treatment may continue for a period Ofabout one hour whereupon the excess caustic liquor is removed bypressing, and the alkali cellulose formed is shredded. Shredding of thealkali cellulose, which may require a period of about two hours, duringwhich temperature may rise to from 24-29" 0,, reduces the alkalicellulose to crumbs, which are then aged at a temperature of 21-23 C.Aging. of the allcali cellulose is followed by conversion into a Kany beprepared a solution containing a strong alkali, for example, sodium andpotassium hydroxides, and 'a. carbonate which may be soluble orinsoluble inwater, admixing cellulose xanthate therewith to form acoagulatable solution, and coagulating in an acid bath.

,As a carbonate utilization may be made of the I carbonates of sodium,potassium, ammonium, i calcium, magnesium and the like, and when thethate, e. g., by treatment with carbon disulfide in a temperature rangefrom 24-30 C., and for a period of about two hours. There is alsoprepared a solution of a strong alkali, preferably sodium hy-' droxide,in a concentration of 3.6%, and to this there is added a carbonate,assodium carbonate.

By way of illustration, to each 845 liters of 3.6% sodium hydroxidethere may be added 99 lbs. of sodium carbonate. The mass is agitateduntil solution hasbeen efiected. If desired, there may now be added tothe sodium hydroxidesodium carbonate solution a delusterer, as t!-tanium dioxide, in an amount of about 3.25 lbs, and a lubricant, as amineral oil, in an amount into a volume of about 8515 liters of thesolution. Following mixing for a period of about thirty minutes at atemperature of about l'V'C. cellulose xanthate is added to form viscse,and the charge is mixed for a periodv upwards of eight hours, i. e., notless'than eight hours. The viscose may now be filtered and a vacuumapplied for about twelve to fourteen hours at -17 C.

Following aging for' a total period of about twenty-four to twenty-eighthours the viscose may again be filtered, and is.then spun by introducinginto a suitable coagulating bath, as an acid bath containing sulfuricacid or sulfuric acid in conjunctionwith sodium sulfate. If desired,other acids, as'hydrochloric and phosphoric, may be utilized in placeofor in conjunction with sulfuric acid. The viscose solution ischaracterized by having a total alkalinity, expressed as sodiumhydroxide of 8.95%; a cellulose content of 7.55%;

a viscosity of 37.5 seconds by the falling sphere method; sodiumcarbonate 3.6%; titanium oxide from 45 to 47 0., and following spinmnthe yarn obtained is processedin the usual manner, i. e., washed, dried,twisted, reeled, bleached,'again dried, inspected and packed for themarket.

The foregoing procedur leads to the production of a textile material,especially a filament of the so-called hollow tube type, inasmuch as thebody of the material contains a multiplicity of voids or pocketsproduced by reaction in the acid bath, giving rise to a gas. It may bemenof about 6 lbs. These amounts are introduced mixing a coagulablematerial belonging to. the group consisting of cellulose esters and acuprammonium solution of cellulose therein.

2: A method for the preparation of a spinning solution for hollowtextile material, which comf prises preparing a solution of an alkalimetal hydroxide, incorporating a carbonate of sodium therein, and thenadmixing a coagulable material belonging to the group consisting ofcellulose esters'and a cuprarnmonium solution of cellulose therewith.

3. A method for the preparation of a spinning solution for hollowtextile material, which comprises preparing a solution of sodiumhydroxide, incorporating a carbonate of sodium therein, and

then admixing cellulose xanthate therewith to formaspinnable solution.

4. A method for the preparation of a spinning solution for hollowtextile material, which comprises preparin an alkali cellulose, coverting said alkali cellulose into a xanthate, p eparing a solutioncontaining an alkali metal hydroxide and a carbonate, and then admixingthe xanthate therewith to form a spinnable solution.

5. A method for the preparation of a spinning solution for hollowtextile material, which comprises preparing an' alkali cellulose,converting said alkali cellulose into a xanthate, preparing a solutioncontaining sodium hydroxide and a carbonate of sodium and then admixingthe xanthate therewith to form a-spinnable solution.

. 6. A method for the preparation of a spinning solution for hollowtextile material, which comprises preparing an alkali cellulose,converting said alkali cellulose into a xanthate, preparing a solutioncontaining an alkali metal hydroxide and a carbonate, adding thereto adelusterer and a lubricant, and then admixin the xanthate therewith toform a spinnable solution.

tioned more particularly that the gas producing compound, as acarbonate, is incorporated with the sodium hydroxideor strong. alkalisolution prior to the introduction of the xanthate thereinto. By sodoing applicantsqbtain a hollow material possessingsatisfactoryqualities, not only from the standpoint of variouspro'cessings during th fabrication of textile materials therefrom,butalso'in regard to the appearance and feel or hand of the productwhile in yarn or other form, and also when forming the whol or part of afin- 'ished textile.

Since certain changes may be made in carrying out the above processwithout departing from the scope of the invention, it is intended thatall matter contained in the above description shall be interpreted asillustrative and not in a limiting sense.

It is also to be understood that the following claims'are intended tocover all of the generic and specific. features of the invention hereindescribed, and all statements of the scope of the inventionwhich, as amatter of language, might be said to fall therebetween.

'Having described our invention, what we claim as new and desire tosecure by Letters Patent, is:

I. A method for the preparation of a spinning solution for hollowtextile material, which comprises preparing a solution containing analkali metal hydroxide. and a carbonate, and then ad- '7. A method forthe preparation of a spinning solution for hollow textile material,which comprises preparing an alkali cellulose, converting said alkalicellulose into a xanthate, preparing a solution containing an alkalimetal hydroxide and a carbonate, adding thereto an oxide of titanium anda mineral oil, andthen admixing the'xanthate therewith to form aspinnable solution.

8. A method for the preparationof a spinning solution for hollow textilematerial, which com-' prises preparing an alkali cellulose, convertingthe alkali cellulose into xanthate by treatment with carbon disulfide,preparing a solution containing sodium hydroxide and. sodium carbon-.ate; then admixing'the xanthate therewith, and

ripening the admixture with attending de-aera-. tion.

9. A method for the preparation of a spinning solution for-hollowingfilament, which comprises preparing an alkali cellulose, converting thealkali cellulose into xanthate by treatment with carbon disulfide at atemperature of about 24-30 C.-for a period of about two hours, preparinga solution containing sodium hydroxide and sodium carbonate, thenadmixing the xanthate therewith for a period upwards of eight hours, andripening the admixture with attending de-aeration at a temperature ofabout 17 C. for a period of about twenty-four to'forty-eight hours.

ORLOW WILLIAM BOIES. HAROLD OLIVER TAYLOR.

